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The Walden III had vane-like fins over the wingtips for "lateral balance". Powered by a 25hp Anzani pusher engine, the single seater made test hops of about 10 yards at a few feet altitude on 9 December 1909, before crashing beyond economic repair.

Reportedly III and IV went to Dyott when the partnership broke up in 1911 and were sold in South America; Walden retained the hangar and inventory.

There were claims of 6 more IIIs under construction, but if they were ever completed, flown, or sold is unknown.